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C. J. LETZING.

LOOK.

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C. J. LETZINGQ LOGK. No. 341,025. Patented May 4, 1886.

(No Model.) 3 Sh'e'ets-Sheet 3 O. .J.- LETZING.

I LOOK. No. 341,025. Patented May 4. 1886.

z I I UNITED STATES PATENT OFFICE oHRIsrIAN J. LETZING, or BosroN,MAssAcHusn'rrs.

LOCK.

S'PECIPICATIN fonning part of Letters Patent No. 341,025, dated May 4,1886.

Application filed July 27, [885.

To aZZ 207mm it may concern- Ee it known that I, CHRIsTIAN J. LETZING,of Boston, in the county of Suffolk and Commonwealth of Massachusetts, acitizen of the United States, have invented a new and useful Improvementin Door-Locks, of which the following is a full, clear, and exactdescription, reference beinghad to the accompanying drawings, forming apart of this specification, in explaining its nature.

The object of the invention is to provide means whereby a door uponbeing unlocked may be opened but a limited distance, and also in variousdetails of construction, all of which will be hereinafter fullydescribed.

Referrin g to the drawings, Figure 1 is a perspeetive view reprcsentingthe application of a lock containingthe features of my invention to adoor. Fig. 2 is a view in horizontal section, representing the doorclosed in dotted lines and open in full Outline. Fig. 3 is an enlargedview in elevation of the lock, looking from behind, to show its interiorconstruction, and also to represent the parts when the latchbolt is inits protracted position. Fig. 4 is a view in elevation of the same partswhen the latch-bolt is in its normal position. Fig. 5 is a detail view,and Fig. 6 is a modification hereinafter referred to.

A represents a door provided with a lock having the features of myinvention..

` B represents the frame-work about the door.

O is the lock. It has a latch-bolt, c, which is provided with theinclined edge 'or face c', the long slot c', and the passage or entrancec3 to the slot,which extends from the end of the slot. This latch-boltis movable in relation to the casing of the lock, as hereinafterspecified, and it is adapted to engage with the catch D, which projectsoutwardly from the inner surface of the frame of the door. This catchconsists of the part (l, having screw-holes d', by which the catch isfastened in place, and the comparatively thin outward-extending platedz, having the Shoulders (P, Fig. 5. This plate dZ is somewhat less inthickness than the width of the passage or entranee 03 to the slot ofthe latch-bolt, and when the door is closed said latchbolt is adapted toproject upon this plate, the portions c' bearing against the shoulders(ZS, as represented in Fig. 5. These shoulders Serial No. 172,713. (Nomodel.)

limit the movement of the door so that it may be opened alimited extent,and then locked, I move the lateh-bolt outward beyond the plate dz, sothat the slot 03 comes beneath the shoulders d3 of the latch, and, theslot being wider than the Shoulders, I am then enabled to open the door,the latch-bolt passing by the shoulders onto the bar E, which is of agreater width than the width of the entrance 'or passage c3 to the slot,so that the latch as the door is moved outward rides on the swinging baruntil it comes in contact with the stop c. This construction effectually prevents the door from being opened a greater distance than isdesired, the distance being regulated by the length of the swinging bar.

In closing the door it maybe shut in the ordinary manner, or the'bar Emay be used as a lever in returning the latch-bolt to a position withinthe line of the shoulders (13, and it will automatically return to itsnormal position.

There are many ways, of course, by which this latch-bolt may be providedwith the necessary movements, and in the drawings I have illustrated oneof these ways only. The latch-bolt c has a shank, ci, extending back-Ward, and provided with a slot, cs, which receives the guides or blockscl, projeeting out.- ward from the casing of the lock, to act as guidesin connection with the slot. The shank also has two pins, cs, projectingoutward therefrom, and they are engaged by the arni f, extending outwardfrom the barrel f turned by the door-haudle ft'. A spring, f3, serves toautomatically return the barrel. A spring, fi, bears against theshoulder f' upon the latchbolt, and holds it in its normal position.VThe lock also has the tu mblers f 6, which are adapted to engage thetongue7 upon the end of the lever fg, which is pivoted at f, and the endof which projects int-o the recess f 10, cut in the shank of). Thelateh-bolt also has a notch, g, in its shank, for the reception' of thepush-block g', Whereby the lateh is held locked, and which block alsoacts to lock the lateh When it is pushed forward, so that it cannot bennlocked by the key. This block is adapted to be moved upward by thelever 92 and push-block (/3, pivoted thereto, the lever being pivoted atgf. A spring surrounds the pivot-post and bears against the lever, toeXert sufficient friction thereon to maintain the block in any positionin which it may be moved.

In Fig. 6 I represent the latch-bolt with a closed slot, instead of anopen one, and use in connection therewith a modified form oflooking-bar. The 'locking-bar in this case being in the form of a hook,the end is adapted to act as an abutment, against which the latchboltshall come in contact When it is used in the ordinary Way; but When saidlateh-bolt is moved outward sufficiently to bring the slot in line withthis portion of the hook it may then ride outward thereon, as upon theportion shown in Fig. 1. Of course this hook is pivoted to swinglaterally.

The advantages' of the invention arise from the simplieity of theconstruction, and from the fact that the movement of the lateh-bolt onlyis required to bring the controlling-bar into effect.

Having thus fully described my invention, I claim and desire to secureby Letters Patent- 1. In a lock, the combination of a bolt or latehshaped as described, and adapted to be moved by a spring to engage witha catch, and to be moved by the knob or handle out- Wardly, to bedisengaged from the catch, and

to engage With the looking-bar, with the locking-bar E, and the plate d,having the shoulders (23, all substantiall y as and for the purposes 40described.

2. The combination, in a lock, of the bolt or lateh shaped substantiallyas described, and adapted to be moved by a spring to engage with acatch, and to be moved by the knob or handle outwa-rd, to be disengagedfrom the catch to engage with thelocking-bar, the plate d, having theshoulders dB, forming the catch, the swinging looking-bar E, secured tosaid plate, and the cross piece, block, or

stop e, for limiting the extent of movenient of the bolt or latch, allsubstantially as and for the purposes dcscribed.

3. The combination of the lateh bolt c,

shaped substantially as specified, to act as a lateh and as a lockingdevice, the Operating' arln f, spring ft, and the guides 87, and thelateh knob or handle, whereby the lateh-bolt is adapted to automaticallyeugage the catch, and to be moved by hand both outward and inward fromthe position to which it is automatically moved, all substantially asand for the purposes described.

CHRISTIN J. LETZING.

lVitn esses:

F. F. RAYMOND, 2d, FRED. B. DOLAN.

